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        <h2 id="一些概念"><a href="#一些概念" class="headerlink" title="一些概念"></a>一些概念</h2><h3 id="java对象"><a href="#java对象" class="headerlink" title="java对象"></a>java对象</h3><p>POJO（Plain Ordinary Java Object，简单Java对象）</p>
<p>POJO在不同环境、场合下有不同意义：</p>
<ul>
<li>PO（Persistant Object，持久对象）：数据库表在java中映射的对象</li>
<li>BO（Business Object，业务对象）：业务层的Java对象</li>
<li>VO（View Object，视图对象）：表现层的Java对象</li>
<li>DTO（Data Transfer Object，数据传输对象）：在两个系统间传递数据，需要将POJO序列化，如RPC</li>
<li>JavaBean：遵循特定写法的java类，通常具有以下特征：<ul>
<li>属性私有</li>
<li>实现getter和setter</li>
<li>具有无参构造函数</li>
<li>实现序列化</li>
</ul>
</li>
<li>EJB(Enterprise JavaBean，企业级JavaBean)：一组JavaBean的集合，组合起来实现某块业务的功能</li>
</ul>
<h3 id="架构分层"><a href="#架构分层" class="headerlink" title="架构分层"></a>架构分层</h3><ul>
<li>Model层：模型层，mvc中的model</li>
<li>Dao层：（Data Access Object，数据访问对象），封装数据库操作（CRUD），常用框架：Mybatis，hibernate，spring-data-jpa等</li>
<li>Service层：业务层，封装业务逻辑，调用dao层进行处理，如跨表查询，判断等问题</li>
<li>Controller层：控制层，用于接收请求，分发到具体service，调用service层方法，返回数据，封装响应页面返回给前端</li>
<li>View层：视图层，如jsp、模板（template）（前后端分离之后，view层就到前端去了）</li>
</ul>
<h4 id="Entity、Model、Domain的区别"><a href="#Entity、Model、Domain的区别" class="headerlink" title="Entity、Model、Domain的区别"></a>Entity、Model、Domain的区别</h4><ul>
<li>Entity：实体，对应数据库表</li>
<li>Model：更接近业务，将entity进行处理</li>
<li>Domain：类似model，model主要是在mvc中提出来的概念，模块化的话称为domain更常见</li>
</ul>
<p>Model会对Entity进行处理：如数据库存储性别用（1，2），Entity里面存储的是int型，经过转换封装成Model，再传给前端，避免前端做判断</p>
<p>Entity和Model在数据库中就相当于表和视图的关系，表存储可能会有很多无用的字段，所以在表上建立视图，用于频繁读取。</p>
<h3 id="JPA"><a href="#JPA" class="headerlink" title="JPA"></a>JPA</h3><p>jpa（java persistent api，java持久化api）</p>
<h3 id="http状态码"><a href="#http状态码" class="headerlink" title="http状态码"></a>http状态码</h3><ul>
<li>1开头的归类为临时响应，并需要客户端继续请求</li>
<li>2开头归类为请求成功</li>
<li>3开头归类为重定向</li>
<li>4开头归类为请求出错</li>
<li>5开头归类为服务器问题</li>
</ul>
<p>http常用的状态码及其对应的含义如下：</p>
<table>
<thead>
<tr>
<th>状态码</th>
<th>含义</th>
</tr>
</thead>
<tbody><tr>
<td>100</td>
<td>客户应该继续发出请求</td>
</tr>
<tr>
<td>101</td>
<td>客户要求服务器根据请求转换HTTP协议版本</td>
</tr>
<tr>
<td>200</td>
<td>服务器响应正常。</td>
</tr>
<tr>
<td>201</td>
<td>提示知道新文件的URL</td>
</tr>
<tr>
<td>202</td>
<td>接受和处理、但处理未完成</td>
</tr>
<tr>
<td>203</td>
<td>返回信息不确定或不完整</td>
</tr>
<tr>
<td>204</td>
<td>请求收到，但返回信息为空</td>
</tr>
<tr>
<td>205</td>
<td>服务器完成了请求，用户代理必须复位当前已经浏览过的文件</td>
</tr>
<tr>
<td>206</td>
<td>服务器已经完成了部分用户的GET请求</td>
</tr>
<tr>
<td>300</td>
<td>请求的资源可在多处得到</td>
</tr>
<tr>
<td>301</td>
<td>删除请求数据</td>
</tr>
<tr>
<td>302</td>
<td>在其他地址发现了请求数据</td>
</tr>
<tr>
<td>303</td>
<td>建议客户访问其他URL或访问方式</td>
</tr>
<tr>
<td>304</td>
<td>该资源在上次请求之后没有任何修改（这通常用于浏览器的缓存机制，使用GET请求时尤其需要注意）。</td>
</tr>
<tr>
<td>305</td>
<td>请求的资源必须从服务器指定的地址得到</td>
</tr>
<tr>
<td>306</td>
<td>前一版本HTTP中使用的代码，现行版本中不再使用</td>
</tr>
<tr>
<td>307</td>
<td>申明请求的资源临时性删除</td>
</tr>
<tr>
<td>400</td>
<td>无法找到请求的资源。</td>
</tr>
<tr>
<td>401</td>
<td>访问资源的权限不够。</td>
</tr>
<tr>
<td>402</td>
<td>保留有效ChargeTo头响应</td>
</tr>
<tr>
<td>403</td>
<td>没有权限访问资源。</td>
</tr>
<tr>
<td>404</td>
<td>需要访问的资源不存在。</td>
</tr>
<tr>
<td>405</td>
<td>需要访问的资源被禁止。</td>
</tr>
<tr>
<td>406</td>
<td>根据用户发送的Accept头，请求资源不可访问</td>
</tr>
<tr>
<td>407</td>
<td>访问的资源需要代理身份验证。</td>
</tr>
<tr>
<td>408</td>
<td>客户端没有在用户指定的时间内完成请求</td>
</tr>
<tr>
<td>409</td>
<td>对当前资源状态，请求不能完成</td>
</tr>
<tr>
<td>410</td>
<td>服务器上不再有此资源且无进一步的参考地址</td>
</tr>
<tr>
<td>411</td>
<td>服务器拒绝用户定义的Content-Length属性请求</td>
</tr>
<tr>
<td>412</td>
<td>一个或多个请求头字段在当前请求中错误</td>
</tr>
<tr>
<td>413</td>
<td>请求的资源大于服务器允许的大小</td>
</tr>
<tr>
<td>414</td>
<td>请求的URL太长。</td>
</tr>
<tr>
<td>415</td>
<td>请求资源不支持请求项目格式</td>
</tr>
<tr>
<td>416</td>
<td>请求中包含Range请求头字段，在当前请求资源范围内没有range指示值，请求也不包含If-Range请求头字段</td>
</tr>
<tr>
<td>417</td>
<td>服务器不满足请求Expect头字段指定的期望值，如果是代理服务器，可能是下一级服务器不能满足请求</td>
</tr>
<tr>
<td>500</td>
<td>服务器内部错误。如代码执行异常</td>
</tr>
<tr>
<td>501</td>
<td>服务器不支持请求的函数</td>
</tr>
<tr>
<td>502</td>
<td>服务器暂时不可用，有时是为了防止发生系统过载</td>
</tr>
<tr>
<td>503</td>
<td>服务器过载或暂停维修</td>
</tr>
<tr>
<td>504</td>
<td>关口过载，服务器使用另一个关口或服务来响应用户，等待时间设定值较长</td>
</tr>
<tr>
<td>505</td>
<td>服务器不支持或拒绝支请求头中指定的HTTP版本</td>
</tr>
</tbody></table>
<h3 id="转发和重定向"><a href="#转发和重定向" class="headerlink" title="转发和重定向"></a>转发和重定向</h3><h4 id="解释一：转发是服务器行为，重定向是客户端行为"><a href="#解释一：转发是服务器行为，重定向是客户端行为" class="headerlink" title="解释一：转发是服务器行为，重定向是客户端行为"></a>解释一：转发是服务器行为，重定向是客户端行为</h4><p>转发过程：客户浏览器发送http请求—-》web服务器接受此请求–》调用内部的一个方法在容器内部完成请求处理和转发动作—-》将目标资源发送给客户；<br>在这里，转发的路径必须是同一个web容器下的url，其不能转向到其他的web路径上去，中间传递的是自己的容器内的request。在客户浏览器路径栏显示的仍然是其第一次访问的路径，也就是说客户是感觉不到服务器做了转发的。转发行为是浏览器只做了一次访问请求。</p>
<p>重定向过程：客户浏览器发送http请求—-》web服务器接受后发送302状态码响应及对应新的location给客户浏览器–》客户浏览器发现是302响应，则自动再发送一个新的http请求，请求url是新的location地址—-》服务器根据此请求寻找资源并发送给客户。<br>在这里location可以重定向到任意URL，既然是浏览器重新发出了请求，则就没有什么request传递的概念了。在客户浏览器路径栏显示的是其重定向的路径，客户可以观察到地址的变化的。重定向行为是浏览器做了至少两次的访问请求的。</p>
<h4 id="解释二：重定向，其实是两次request"><a href="#解释二：重定向，其实是两次request" class="headerlink" title="解释二：重定向，其实是两次request,"></a>解释二：重定向，其实是两次request,</h4><p>第一次，客户端request   A,服务器响应，并response回来，告诉浏览器，你应该去B。这个时候IE可以看到地址变了，而且历史的回退按钮也亮了。重定向可以访问自己web应用以外的资源。在重定向的过程中，传输的信息会被丢失。</p>
<p>请求转发是服务器内部把对一个request/response的处理权，移交给另外一个<br>对于客户端而言，它只知道自己最早请求的那个A，而不知道中间的B，甚至C、D。 传输的信息不会丢失。</p>
<h4 id="解释三：假设你去办理某个执照，"><a href="#解释三：假设你去办理某个执照，" class="headerlink" title="解释三：假设你去办理某个执照，"></a>解释三：假设你去办理某个执照，</h4><p>重定向：你先去了A局，A局的人说：“这个事情不归我们管，去B局”，然后，你就从A退了出来，自己乘车去了B局。 </p>
<p>转发：你先去了A局，A局看了以后，知道这个事情其实应该B局来管，但是他没有把你退回来，而是让你坐一会儿，自己到后面办公室联系了B的人，让他们办好后，送了过来。</p>
<p>注：</p>
<p>转发或重定向后需要return避免代码往下执行。<br>连续发两次forward，会报错：Cannot forward after response has been committed</p>

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